Thermostatic cut-off device for gas-burners.



J. W. PEPLINSKI.. V'IHERMOSTATIC GUT-OFF DEVICE FOB GAS BUBNERS.

AIPPLICIATION FILED PEB. 15, 1909.

Patented Apr. 11, 1911.

-J'ULIUS W.`PE1?LINSKI, 0F ERIE, PENNSYLVANIA.

THERMOSTATIQ CUT-OFF DEVICE FOR GAS-BURNEBS.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed February 15, 1909. Serial No. 477,854.

-produced by said burner and causes the gas to be shut oil' in the event of the burner flame being extinguished, or of an unforeseen abnormal ehange in the temperature affecting the thermostat.

p The primary object of the invention is to produce an eflicient thermostatic cut-off dof vice of simplepractical and inexpensive construction, which can be readily applied, and which will shut off the gas to the burner in the event either of the burner flame being extinguished fromny-cause or of a change in the gas pressure such as to abnormally increase the heat produced by the burner.

Other objects of the invention are to provide a cut-o valve of novel construction which positively prevents the leakage of gas around the valve stem in both the open and closed positions of the valve without the use of a stuffing box for the valve stem, so that the valve will move easily and but 'little power is required to operate it; and also to improve cut-ott' devices for the purpose stated in the respects hereinafter described and set forth in the claims.

In the accompanying drawings: Figure 1 Vis a sectional elevation of a thermostatic cut-ofi device embodying the invention. Flg. 2'is a sectional lan view thereof, on an enlarged scale, in line 2-2, Fig. l, looking upwardly as indicated by the arrow.

Fig. .Bis a transverse sectional elevation thereof, on an enlar ed scale, in line 3-3, Fig. 1. Fig. 4 is a Iragmentary plan view thereof.

Like letters .of reference refer to like parts in the several figures. l

The cut-olf device shown in the drawings is intended for ,application to gas stoves, but the device is not restricted to this use and with suitable modification in the form and A represents a stove burner of ordinary construction and B an ordinary hand cock or valve for controlling the flow of gas to the burner. Between the burner A and valve B is a cut-olf valve C which is controlled automatically by a thermostat and is preferablyof the following construction. This valve is of the globe type, but the casing thereofl has, in addition to the usual seat c on which the valve' is held to shut olf the gas, a second seat c2 which surrounds the hole through which the .valve stom or rod c3 passes and on which the valve is lheld when open to prevent the escape of gas from the casing through the valve stem hole. The valve stem c3 extends loosely through a guide tube or tubular extension c* of the valve casing, and a spring c5 is shown in the guide tube around thevalve stem for closing the valve. When the valve is closed, or held on the seat c by the spring c5, the gas of course cannot escape through the valve stem hole, and when the valve is open it is held againstthe second seat c2, which also prevents the es! around the valve stem, whichwould make the valve Work hard, is required. p

D represents a lever for opening the cut-oftn valve C. This lever is preferably secured I to or formed with a circular disk d pivoted by a screw el in a cylindrical casing (l2 at the end of a tubular support d which is held on the guide tube '0* for the stem` of the cut-oli' valve.A The lever disk d isconnected' to the stem of the out-off valve C by a spring E located in the tubular support cl3. This spring is stronger than the valve closing spring c5 and acts, when the Vlever D is turned to 'the posit-ion shown in Fig. 1, to open the valve and hold it firmly against its second seat c2.

F represents an expansible or thermostat rod which is located so as to be affected by the heat-produced by the flame from the burner A. As,sliown,this thermostat rod is secured at one end to or provided with a latch bolt f which'is arranged to slide in a guide boss f on the'lever casing and is provided' at its inner end with a lateral projec# tion f2 adapted to enga e a coperatin stud f3 projecting from the everl disk to ho d the lever in position to retain the cut-off valve open. The thermostat rod is fixed at its other or outer end to a fitting g which is secured to a part of the stove casing, indicated by dotted lines at H; or this end of the rod can be Stationarily secured in any suitable way so that either the expansion or contraction of the rod, due to a change in the temperature affecting it, Will move the latch projection f2 out of engagement with the lever stud f3 and release the lever. The thermostat rod preferably passes loosely through a screwthreaded nipple e' which is secured on the stove casing H and is conn nected by a right and left hand threaded coupling sleeve I to the guide boss f on the lever casing d2 for adjusting the lever casing and the lever D relative to the thermostat rod. -i is a jam nut for holding thc coupling sleeve when adjusted. Any other suitable mean for adjusting the lever D relative to the thermostat rod F could be employed.

In the use f the device the hand cock B is set to give the desired flame and the cutoifvalve is opened 'by turning the lever D to the position shown in Fig. 1 and the gas Y is lighted. The lever D is retained in the open position until the thermostat rod is fully expanded by the heat from the ame and the vcoupling sleeve I is then adjusted so that the projection of the latch f will eIi vage the stud f3 of the lever D and hold the ever D with the cut-off valve open. If the flame is extinguished from any cause, the thermostat rod will contract and/move the latch projection out of engagement with the lever stud, thus releasing the lever and permitting the cut-off valve to be closed by its spring c5 to shut olf the gas. On the other hand, if-the heat is abnormally augmented, for example, by an increase inthe gas pressure after the device has been adjusted, the consequent expansion of the thermostat rod will also move the latch projection f2 out of engagement with'the lever stud f3 butin the opposite direction, and likewise release the lever and allow the cut-off valve to be closed bym its spring c5. Thus the cut-off valve C will automatically close `and prevent danger either from escaping gas if the,

flame is extinguished from anycause, or from too hot a`ire if the gas pressure ab.- normally increases.

K represents a hook or catch which is pivoted to the lever casingd2 and is adapted to be moved into en agement with the lever D to hold the cut-ovalve open until the thermostat is set when first lighting the burner. After the device is properly adjusted this hook K ismoved out of engagement with the lever, leaving the latter under the control of the thermostatF.

The device constructed as 'described is eiiii cient and practical. The thermostat sim ly actuates the latch which controls the va ve and does not itself move the valve, so that the device can be set to operate with great exactness and to produce different desired results by diiferent adjustments of the thermostat.

I claim as my invention:

1. The combination with `a burner and a valve which controls the flow of f'el to the burner, of devices for closing the valve, means for locking said devices against action, and a thermostatic element subjected to heat from the burner and actuatin said means to unlock said devices to close t e valve with .an abnormal increase or decrease in the tem- 3. The combination w-th a burner, and av valve which controls tkhe fiow of fuel ,to the burner, of means for opening and closin said valve, a latch which coperates witg said means to hold the valve open, and a thermostat element which is affected by the heat from the burner flame and operates said latch to release said valve by either an abnormal expansion or contraction of said element incident to an abnormal increase or decrease in the temperature of the element, substantially as set forth.

4. The combination with a burner, of a cutoif valve therefor, a casing havin seats for said valve, a spring for c osing said valve against one seat, a valve o ening lever, a spring which connects sai ,lever and valve and holds the valve against said other seat when open, a latch which coperates with said lever to hold-said valve open, and a thermostat element which is affected by the heat from the burner flame and releases said lever upon an abnormal change in the tcmperatureaifecting said element, substantially as set forth.

Witness my hand, this 10th day of February, 1909.

Witnesses:

G. 1t. DnNoH, M. L. BLUM.

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